Papers by Keyword: Magnetomechanical Damping

Abstract: The strain amplitude-independent and strain amplitude-dependent components of the internal friction in a Ni₄₅Mn_36.7In_13.3Co₅ metamagnetic shape memory alloy have been studied as function of temperature, strain amplitude and polarizing magnetic field. For ultrasonic oscillation frequency (91 kHz) and low strain amplitudes (10^-7-10^-5), the experimental results show that the internal friction in the ferromagnetic austenite is much higher than in non-magnetic martensite. We suggest that this unusual relationship is due to a high contribution of the magnetomechanical component to the internal friction of the ferromagnetic austenite.

Abstract: The influence of heat treatment on the amplitude dependence of internal friction in Fe - 11 at. % Al alloys with carbon contents in the range 0.005 - 0.2 at. % has been studied using an inverted torsion pendulum in the temperature range 300 – 950 K and a vibrating reed apparatus at room temperature. The specimens were annealed at 1273 K in vacuum and cooled down with different cooling rates in order to obtain different degrees of order. It was found that ordering is hardly avoidable in Fe - Al alloys with Al contents > 11 at. %. Ordered alloys are characterised by lower damping capacity due to higher coercivity caused by additional pinning of magnetic domain walls by antiphase boundaries. X-ray diffraction investigations indicate that water-cooling suppresses ordering in Fe - 11 at. % Al alloys while cooling in air or in furnace provokes D03–type ordering. Slowly cooled specimens are characterised by higher damping capacity due to lower coercivity than water cooled or plastically deformed specimens. The amplitude dependent magneto-mechanical damping was determined as the difference between amplitude dependent damping without and with saturating magnetic field (~ 20 kA/m). Magneto-mechanical damping was found to be proportional to the strain where the amplitude dependent damping is maximum and reciprocal to the coercivity and saturation polarisation. Cold rolling increases the coercivity and therefore decreases the magneto-mechanical damping. An increase of the grain size in the investigated samples by heat treatment leads to a qualitatively expected decrease of coercivity and therefore to an increase of magneto-mechanical damping.

Abstract: It is shown that industrial high damping steels based on the Fe-Al metallic system are characterized by a very high level of internal dissipation of elastic energy. The specific damping capacity of industrial steels exceeds 40 % and their damping properties are close to those of highpurity damping alloys based on the Fe-Al system. Mechanical properties of damping steels are similar to those of conventional construction steels. High level of properties of damping steels can be explained by their specific crystalline and magnetic structure.